Circumference = 60 miles
ie 2*pi*r = 60 miles, where r is the radius.
So r = 30/pi = 9.55 miles (approx)
and then area = pi*r2 = 286.48 sq miles.
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That depends whether the "10-mile circle" refers to the circle's radius, its diameter, or its circumference. Assuming it is the diameter, divide it by 2 (to get the radius), then use the formula: area = pi x radius2.
Assuming that "1 inch round circle" refers to a circle whose circumference is 1 inch, its area is 51.34 sq mm.
It is greater by 18.8 feet.
If you have a circular area with a 50-mile radius, the area of the circle is approximately 7,854 square miles (rounded).
the M25 is reported to be 117 miles long , so if it was a circle the area can be calculated C = 2 pie R where c is circumference and R the radius so R = 117/2 Pie = 18.6 miles approx so the area A = pie R squared A=1087 miles if it was a circle which it isnt so i would take away somewhere between 5 and 15 per cent 5% of 1087 = about 54 15% about 162 so about 925 - 1033 square miles , although ive read somewhere its only about 600 square miles so maybe my maths is a bit dodgy when im drunk